1. This screw kit is made of metal, specifically titanium alloy, which has good quality and durability. Its specification is the specific R8000 model, suitable for the caliper brakes and front and rear derailleur shifting systems of road bicycles. 2. In terms of use, this screw kit can well meet the installation and use requirements of the braking and shifting systems of road bicycles, providing stable support for the normal operation of road bicycles. It is carefully designed and manufactured to precisely fit relevant components, making the braking and shifting operations of road bicycles smoother and more efficient, and improving the safety and comfort of riding. Whether for daily riding or professional competitions, it can play an important role. 3. With its material and excellent craftsmanship, this screw kit can adapt to various road conditions and environments, bringing a reliable user experience to road bicycle enthusiasts. 4. It is a good choice for the repair, upgrade, and maintenance of road bicycles, which helps to build a road bicycle with good performance.